Definition of hair grass in English:

noun

High above tree line, this renegade group had survived nicely on a diet of heather, trailing azalea, tufted hair grass, and the leaves and stems of cowberries and blueberries.

Marshall suggests that climatic factors restrict the distribution of the grey hair grass to the south of this isotherm because the grass cannot germinate or flower in areas affected by low temperatures.

Crested hair grass has no special soil requirements and is therefore not sensitive to aridity.